Today there is nothing to see. The river runs fast at this stretch, and whatever timber or stone once held back the water has long since been swallowed by the current or dismantled and forgotten. That absence is itself a kind of record, a gap in the landscape where a working structure used to shape how people ate and earned.

The weir's existence is first documented in the Civil Survey of 1654 to 1656, a detailed Cromwellian-era land assessment compiled to establish ownership and value across Ireland following the wars of the 1640s. The entry, recorded in the parish of Killoluan, notes "a weare uppon the River of Annor betweene the said lands of Ballenvohyr and the lands of Newtown-Annor," which places it squarely as a boundary feature as much as a practical one. Fish weirs of this kind were typically low structures of stone, timber, or wicker built across a river to trap fish, particularly eels, as the current funnelled them into a confined channel or basket. By the time the first edition Ordnance Survey maps were drawn in 1840, two weirs appear at this location, and the eastern one is specifically named the Eel Weir, a detail that confirms what the river was primarily being worked for. Eels were a significant food source and trade commodity in early modern Ireland, taken in large numbers from suitable rivers each season. The second edition maps of 1904 show both weirs still marked, though only the eastern one retains its name, suggesting the western structure had perhaps already fallen into disuse or obscurity by that point.